summary of research methods part 1

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Summary of research methods part 1
Methods and techniques
technique description strengths weaknesses
Lab experiment The IV is altered High internal Too artificial
directly by the validity- all and therefore
experimenter. All extraneous has low
other extraneous
variables are ecological
variables are tightly
controlled. The controlled validity, so its
dependent variable is therefore cause unable to be
observed and and effect generalised to
recorded. Participants relationships can real life
are randomly be determined Demand
allocated to the
Can be replicated characteristics
to check are likely as the
reliability of situation is so
findings artificial and
the participants
know they are
experimented on
Field A type of Demand Less control
experiment investigation whereby characteristics which means that
the IV is manipulated are less likely to there is a low
but the type of study
the behaviour of internal validity
occurs outside, raising
the possibility of the subjects, Can't get cause
extraneous variables removing a and effect so
therefore influencing possible therefore you
the DV confounding can't generalise
variable the results
Results will have
greater ecological
validity as the
experiment is
conducted in a
less artificial
Natural The IV isn't altered Has high Cannot
experiment by the experimenter, ecological validity demonstrate
but another force of if it is a natural cause and effect
nature. Extraneous
setting relationships as
variables are
controlled but the Allows you to the IV is not
extent to which is experiment on directly
determined by the patients unlike manipulated
environment the the lab

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Greater risk of
conducted in. unethical EV's lowering
internal validity
Studies using a Two DV's and they are Allows the Cannot establish
correlation or linked together but investigation of cause and effect
relationship cause and effect can't areas in which an relationships
be established
experiment would Issues with
be unethical curvilinear
relationships as
these contain
positive and
which cancel
each other out
Observations 1. Conduct a pilot Conclusions may Little control of
(controlled and study have high EV's in
natural) 2.…read more

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Problems over
questionnaires sample size
because it takes
a long time to
interview people
Case studies A study is focussed on Allows the Low population
small numbers of investigation of validity
people but in a large areas that would Can't generalise
amount of detail
be unethical in an the findings to
experiment others (low
Investigation design- naturalistic observations and self reports
Naturalistic observation questionnaire interview
Procedure Conduct a pilot study to 1.…read more

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Train the observers 3. Problems with
so they become more internal validity
reliable with each re order or re
other write the
questions and
recheck using
the split half
technique, need
to get the same
score to be
Investigation design- ethical issues
Consent All participants know what FIC can give rise to
the investigation is about and Demand characteristics so
what could happen to them other types may be used.…read more

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